Thermal Eagle CG

[John Walter]

I bought an old Thermal Eagle on eBay. It has the 7037 airfoil. This will be my first full-house ship. The AUW is 70 oz when balanced 5" behind LE (50% of root chord. It should take about 2.5 oz in the nose to bring the CG forward 1/2".

Does anyone know the recommended starting point for the CG and/or control throws?

Thanks for any help with this.

[petefly58]

I have a Thermal Eagle with RG 15 airfoil. The CG on the plans is 5 1/8 inch ahead of the wing trailing edge. The recommended surface throws are: Ailerons: 3/4 up, 3/8 down. 3/8 down for launch. Elevator: 3/8 up, 1/2 down, 3/8 down with full flap Rudder: 1-1/4 right and left, 1" with full aileron. Flaps: 90 degrees for landing. 1" down for launch. Camber: 3/32 down with full up elevator. Hope this helps!!

Pete

[John Walter]

Thanks for the info. I just checked the tow hook position and it is 4.75 inches behind the LE. Given the 10.0 inch chord. it sounds like the CG is almost directly above the hook.

[Ollie]

http://www.polecataero.com/
Look at Articles
Read "CG Location by Dr. Mark Drela"

[John Walter]

Ollie:

Thanks for the link. I had read that article in the past and found it very useful for trimming my planes. My big concern here was starting out with divergent stability on a new plane, especially my first full house.

I hope to see you again at WC 2005. I plan to bring a new KA8 and Blanik L-13, so I better figure out full-house soon!